Remote control two-wheel model

ABSTRACT

An RC two-wheel model is composed of a frame assembly, a front wheel assembly, and a rear wheel assembly. The frame assembly includes a frame body and a transmission set mounted to the frame body. The front wheel assembly includes a front wheel frame and a front wheel. The front wheel frame is rotatably mounted to the frame body at a top end thereof and has a pair of front forks. The front wheel is rotatably connected with a bottom end of the two front forks. The rear wheel assembly includes a rear wheel frame connected with the frame body, and a rear wheel rotatably connected with the rear wheel frame and the transmission set. Therefore, the above design can simplify and expedite the performance calibration, assembly, and repair of the RC two-wheel model.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to remote control model, and more particularly, to a remote control two-wheel model.

2. Description of the Related Art

An remote control (RC) two-wheel model, like a motorcycle, has a fancy appearance and can be exciting in racing, so it becomes more and more popular for the fans of remote control models. For equality of the racing, there are rules and regulations regarding the specification of the RC model, like ratio, size, and wheelbase. In light of this, under the rules and regulations, for the RC model, how to effectively simplify its structure, shorten the time of its assembly and repair, and calibrate its performance up to the optimum will dominate the racing achievement.

In general, the maneuverability and stability of the RC model are subject to the included angle between the front fork of the RC model and the ground very much. A conventional front fork is designed with a pivot at its top end in such a way that the front wheel rotatably mounted to a bottom end of the front fork needs movement before the included angle between the front fork and the ground. However, the movement of the front wheel will change the wheelbase between the front and rear wheels, such that it is necessary to adjust other design parameters to conform to the racing rules and regulations.

On the other hand, the performance of the transmission set of the RC model brings a major effect to the power transmission of the RC model, so that the transmission parts (e.g. chains or belts) of the transmission set need frequent adjustment to maintain proper tightness. However, in the prior art, when the transmission parts are adjusted, the wheelbases between the other parts (e.g. teeth plates and chain wheels) in the transmission set are changed.

Under the circumstances, it is very inconvenient and annoying for the racing fans to take much time and energy to calibrate the performance of their RC models.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an RC two-wheel model, which can simplify and expedite its performance calibration, assembly, and repair.

The foregoing objective of the present invention is attained by the RC two-wheel model composed of a frame assembly, a front wheel assembly, and a rear wheel assembly. The frame assembly includes a frame body and a transmission assembly mounted to the frame body. The front wheel assembly includes a front wheel frame and a front wheel. The front wheel frame is rotatably mounted to the frame body at a top end thereof and has a pair of front forks. The front wheel is rotatably connected with a bottom end of the two front forks. The rear wheel assembly includes a rear wheel frame connected with the frame body, and a rear wheel rotatably connected with the rear wheel frame and the transmission set.

By means of the three modules, the frame assembly, the front wheel assembly, and the rear wheel assembly, the RC two-wheel model can be definitely assembled and disassembled in a short time. Besides, the front wheel assembly can be shifted along an arc-shaped course relative to the frame assembly, so that the included angle between the two front forks and the ground can be adjusted to simplify the performance calibration of the RC two-wheel model.

In the RC two-wheel model, the transmission set further includes a motor, a gear shaft, a first driving gear, a second driving gear, a passive gear, and a chain. The motor is mounted to a movable member of the frame assembly. The gear shaft is rotatably mounted to the movable member. The first driving gear is connected with one end of the gear shaft to be connected with the motor. The second driving gear is connected with the other end of the gear shaft. The passive gear is rotatably mounted between the rear wheel frame and the rear wheel. The chain engages the second driving gear and the passive gear. When the movable member is moved, the distance between the second driving gear and the passive gear can be changed to adjust the tightness of the chain.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a preferred embodiment of the present invention.

FIG. 2 is an exploded view of a part of the preferred embodiment of the present invention.

FIG. 3 is a side view of the preferred embodiment of the present invention. Illustrating that the front wheel frame has not shifted upward.

FIG. 4 similar to FIG. 3 illustrates that the front wheel frame is shifted upward.

FIG. 5 similar to FIG. 4 illustrates that the front wheel frame is shifted upmost.

FIG. 6 is an exploded view of a part of the preferred embodiment of the present invention, illustrating the interrelationship among the frame assembly, the rear wheel assembly, and the transmission set.

FIG. 7 is top view of a part of the preferred embodiment of the present invention, illustrating that the movable member has not moved relative to the limiter.

FIG. 8 similar to FIG. 7 illustrates that the movable member is moved rightward relative to the locating member.

FIG. 9 similar to FIG. 8 illustrates that the movable member is moved rightmost relative to the locating member.

FIG. 10 is an exploded view of a part of the preferred embodiment of the present invention, showing alternative base and movable member.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Referring to FIG. 1, an RC two-wheel model 10 constructed according to a preferred embodiment of the present invention is an RC model motorcycle composed of a frame assembly 20, a front wheel assembly 30, and a rear wheel assembly 40.

Referring to FIGS. 2 and 6, the frame assembly 20 includes a frame body 21, a base 22, a movable member 23, two first fasteners 24, a side cover 25, and a transmission set 26. The frame body 21 has two convex portions 212 protruding upward from a top edge thereof. Each of the convex portions 212 has a multi-position portion 214 which defines three first locating holes arranged in the shape of an arc. The base 22 has its two sides be fixed to the frame body 21 and is located at a bottom side of the frame body 21, having an inserting piece 221 and two first through holes 223. Each of the two first through holes 223 is located at a left or right side of the inserting piece 221. A battery 50 can be installed to a bottom side of the base 22. The movable member 23 is located above the base 22 and has a second through hole 232, two fixing holes 234, a third through hole 236, and two fourth through holes 238. The second through hole 232 and the two fixing holes 234 are formed at a bottom side of the movable member 23. The third through hole 236 and the two fourth through holes 238 are formed at a lateral side of the movable member 23. The second through hole 232 is provided for inserting the inserting piece 221 in such a way that the movable member 23 can be moved forward and backward relative to the base 22. The two fixing holes 234 each are located at a left or right side of the second through holes 232, corresponding to one of the first through holes 223. The two fourth through holes 238 are located above and below the third through hole 236 respectively. The two first fasteners 24 are inserted through a washer 242 and then one of the first through holes 223 to be fixed to one of the fixing holes 234 in such a way that the movable member 23 is disabled from forward and backward movement. The side cover is fixed outside the frame body 21 and fixed to the base 22. The transmission set 26 has a motor 261, a gear shaft 262, a first driving gear 263, a second driving fear 264, a passive gear 265, and a chain 266. The motor 261 is fixed to the movable member 23 by means of a second fastener 27 inserted through the fourth through hole 238 and has an output shaft 267 inserted through the third through hole 236. The gear shaft 262 is rotatably inserted into the movable member 23. The first driving gear 263 is connected with one end of the gear shaft 262 and located at a left side of the movable member 23. The second driving gear 264 is connected with the other end of the gear shaft 262 and located at a right side of the movable member 23. The chain 23 engages the second driving gear 264 and the passive gear 265.

Referring to FIGS. 2-3, the front wheel assembly 30 includes a front wheel frame 31 and a front wheel 32. The front wheel frame 31 has an upper limiter 33 a, a lower limiter 33 b, a pair of front forks 34, a locating member 35, two fastening pieces 36, a fastening pin 37, a steering server 38, a pivoting member 382, and a steering linking member 384. Each of the front forks 34 is inserted through the upper and lower limiters 33 a and 33 b and has its top end be fixed to the upper limiters 33 a and have its bottom end be rotatably connected with the front wheel 32. The locating member 35 has its front end be rotatably mounted to the upper and lower limiters 33 a and 33 b and has its rear end be inserted into the frame body 21 to allow the angle of the front wheel assembly 30 to be adjusted relative to the frame assembly 20. The locating member 35 15 has a second locating hole 352 formed at a rear end thereof for corresponding to one of the first locating holes 214 as the locating member 35 is pivoted relative to the frame assembly 20. The locating member 35 also has an axial portion 354 and two fifth through holes 356 each formed at a left or right side thereof. Each of the two fastening pieces 36 is inserted through one of the first locating holes 214 to be fixed to the second locating hole for fastening the locating member 35 to the frame body 21. The fastening pin 37 is inserted through the frame body 21 and the axial portion 354 and then connected with a screw nut 372 to enable the axial portion 354 to be fixed to the second fifth through holes 356, thus allowing its movement within the fifth through holes 356 as the locating member 35 is pivoted relative to the frame assembly 20. The steering server 38 is mounted inside the locating member 35 for provide steering power. The pivoting member 382 is connected with the steering server 38 to be pivoted by the steering server 38. The steering linking member 384 is connected with the pivoting member 382 and the upper limiter 33 a to be pivoted by the pivoting member 382 to drive the front wheel 32 to turn through the upper and lower limiters 33 a and 33 b.

The rear wheel assembly 40 includes a rear wheel frame 42 and a rear wheel 44. The rear wheel frame 42 is fixed to the frame body 21 by a bolt 46. The rear wheel 44 is rotatably mounted to the rear wheel frame 42 and connected with the passive gear 265.

Before the angle between the front forks 34 and the ground is adjusted, while the angle between the two front forks 34 and a normal vertical to the ground is θ₁, as shown in FIG. 3, the wheelbase between the front and rear wheels 32 and 44 is L.

When it is intended to adjust the angle between the front forks 34 and the ground, detach the two fastening pieces 36 to allow the front wheel frame 31 to pivot downward on a pivot (an axis of the front wheel 32) between the two front forks 34 and the front wheel 32 along the arc-shaped course. In the meantime, the axial portion 354 of the locating member 35 is movable within the two fifth through holes 356 as the front wheel frame 31 is pivoted, as shown in FIGS. 3-5. Once the frame wheel frame 31 is adjusted to a proper position, fasten the two fastening pieces 36 to the locating member 35 through one of the first locating holes 214 to disable the front wheel frame 31 from any pivoting movement. Under the circumstances, the angle between the two front forks 34 and the normal vertical to the ground is θ₂ and the wheelbase between the rear wheels 32 and 44 is still L, as shown in FIG. 4.

If it is intended to adjust the angle between the front forks 34 and the ground, repeating the aforesaid steps can adjust the angle between the two front forks 23 and the normal to θ₃. The wheelbase between the front and rear wheels 32 and 44 is still L, as shown in FIG. 5.

When it is intended to adjust the tightness of the chain 266, referring to FIGS. 6-9, loose the two first fasteners 24 respectively to allow the movable member 23 to move relative to the base 22 via the second through hole 232 and the inserting piece 221. In the process of the movement of the movable member 23, the motor 261, the gear shaft 262, the first driving fear 263, and the second driving gear 264 can be moved along with the movable member 23 to change the distance between the second driving gear 264 and the passive gear 265 in such a way that the tightness of the chain 266 can be adjusted. When the tightness of the chain 266 is adjusted to the most proper one, tighten the two first fasteners 24 to fasten the movable member 23, such that the tightness of the chain 266 is completed. Besides, to keep the proper engagement between the output shaft 267 of the motor 261 and the first driving gear 263, the two second fasteners 27 can be loosened to allow the motor 261 to move relative to the first driving gear 263 through the third and fourth through holes 236 and 238 and then tighten the two second fasteners 27 after the motor 261 is moved to the proper position.

It is to be noted that the respective numbers of the convex portion, the first through hole, the second through hole, the fixing hole, and the first fastener are not limited to those mentioned above and can be optional. As shown in FIG. 10, there are two convex portions 221, one first through hole 223 located between the two convex portions 221, two second through holes 232, one fixing hole 234 located between the two second through holes 232, and one first fastener 24. Likewise, the movable member 23 can be moved relative to the base 22 via the second through holes 232 and the inserting pieces 221, and the first fastener 24 is inserted through the first through hole 223 to be fixed to the fixing hole 234 to disable the movable member 23 from movement.

In conclusion, the RC two-wheel model of the present invention can be conveniently disassembled and the angle between the front forks and the ground can be properly adjusted via the pivoting movement of the front wheel frame without any change of the wheelbase between the front and rear wheels. Besides, moving the movable member can easily adjust the tightness of the chain, such that it is not necessary to adjust parameters of many components to complete the performance calibration.

Although the present invention has been described with respect to a specific preferred embodiment thereof, it is no way limited to the details of the illustrated structures but changes and modifications may be made within the scope of the appended claims. 

1. An RC two-wheel model comprising: a frame assembly having a frame body and a transmission set; a front wheel assembly having a front wheel frame and a front wheel, the front wheel frame having its top end be pivoted to the frame body and having a pair of front forks, the front wheel being rotatably connected with a bottom end of the two front forks to allow angle adjustment of the front wheel frame on a pivot of the front wheel relative to the frame assembly along an arc-shaped course; and a rear wheel assembly having a rear wheel frame and a rear wheel, the rear wheel frame being connected with the frame body, the rear wheel being rotatably connected with the rear wheel frame and the transmission set.
 2. The RC two-wheel model as defined in claim 1, wherein the frame body includes a multi-position portion extending along an arc-shaped course and connected with the front wheel frame.
 3. The RC two-wheel model as defined in claim 2, wherein the front wheel frame further comprises an upper limiter, a lower limiter, and a locating member, the locating member having its front end be pivoted between the upper and lower limiters and having its rear end be pivoted to the multi-position portion, each of the front forks being inserted through the upper and lower limiters and having its front end be fixed to the upper limiter, whereby the angle between the two front forks and the ground can be adjusted without any change of the wheelbase between the front wheel and the rear wheel.
 4. The RC two-wheel model as defined in claim 3, wherein the multi-position portion comprises at least two pairs of first locating holes; the locating member comprises a second locating hole; the front wheel frame comprises two fastening pieces which can be selectively inserted through one of the first locating holes to be fixed to the second locating hole.
 5. The RC two-wheel model as defined in claim 3, wherein the locating member comprises an axial portion and two opposite through holes, the axial portion having its two ends be inserted into one of the through holes to be movable within the two through holes; the front wheel frame comprises a fastening pin fixed to the frame body and inserted through the axial portion.
 6. The RC two-wheel model as defined in claim 3, wherein the front wheel assembly further comprises a steering server mounted in the locating member, a pivoting member pivoted to the steering server, and a steering linking member connected between the pivoting member and the upper limiter.
 7. The RC two-wheel model as defined in claim 1, wherein the frame assembly comprises a base and a movable member, the movable member being movably mounted to the base; the transmission set comprises a motor, a gear shaft, a first driving gear, a second driving gear, a passive gear, and a chain, the motor being mounted to the movable member, the gear shaft being rotatably inserted through the movable member, the first driving gear connected with an end of the gear shaft, the passive gear being rotatably mounted between the rear wheel frame and the rear wheel, the chain engaging the second driving gear and the passive gear.
 8. The RC two-wheel model as defined in claim 7, wherein the base of the frame assembly further comprises at least one convex portion and at least one first through hole; the movable member of the frame assembly further comprises at least one second through hole and at least one fixing hole, the at least one convex portion being mounted to the at least one second through hole, the at least one first through hole communicating with the at least one fixing hole; the frame assembly further comprises at least one fastener inserted through the at least one first through hole to be fixed to the at least one fixing hole.
 9. The RC two-wheel model as defined in claim 8, wherein the at least one convex portion is one in number; the at least one first through hole is two in number; the at least one second through hole is one in number; the at least one fixing hole is two in number; the at least one fastener is two in number.
 10. The RC two-wheel model as defined in claim 8, wherein the at least one convex portion is two in number; the at least one first through hole is one in number; the at least one second through hole is two in number; the at least one fixing hole is one in number; the at least one fastener is one in number.
 11. The RC two-wheel model as defined in claim 7, wherein the movable member comprises a third through hole and at least one fourth through hole; the motor comprises an output shaft inserted through the third through hole to engage the first driving gear; the transmission set further comprises at least one fastener inserted through the fourth through hole to be fixed to the motor. 